Compilare: user.cpp: In function ‘int main()’: user.cpp:179:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < cycle.size(); i++) { ^ user.cpp:187:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = where; i < cycle.size(); i++) { ^ user.cpp:140:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dans.in", "r", stdin); ^ user.cpp:141:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dans.out", "w", stdout); ^ user.cpp: In member function ‘void FastReader::AdvancePointer()’: user.cpp:38:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer_, 1, kMaxDim, stdin); ^